It seems like people on the LEGO site are assuming that it's Yazneg, but I looked at the videos/pics and didn't see the figure clearly labelled anywhere (it is on the poster, but the name isn't visible on the video).

EDIT: I had seen the listing above, but it's prefaced with this statement: "So, it appears the sets have these minifigures", making it appear to be an educated guess based on the video in question. My Top 5 Wish List for "The Hobbit"5. Legolas will surf down Smaug's neck 4. Bilbo will be revealed to a Robot 3. Naked PJ cameo as Ghan-Buri-Ghan 2. Use of not only 3D, but smell-o-vision, plus the inclusion of axes coming out of the seats and poking the audience when appropriate 1. Not only keep the claim that Thorin & Co. ran amok in Mirkwood "molesting people", but depict said incident in vivid detail!!!!!